Guid.Empty Field
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
A read-only instance of the Guid class whose value is guaranteed to be all zeroes.
Assembly: mscorlib (in mscorlib.dll)
You can compare a GUID with the value of the Guid.Empty field to determine whether a GUID is non-zero. The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.
Module Example Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock) ' Create a GUID and determine whether it consists of all zeros. Dim guid1 As Guid = Guid.NewGuid outputBlock.Text += guid1.ToString() + vbCrLf outputBlock.Text += String.Format("Empty: {0}", guid1 = Guid.Empty) + vbCrLf outputBlock.Text += vbCrLf ' Create a GUID with all zeros and compare it to Empty. Dim bytes(15) As Byte Dim guid2 As New Guid(bytes) outputBlock.Text += guid2.ToString() + vbCrLf outputBlock.Text += String.Format("Empty: {0}", guid2 = Guid.Empty) + vbCrLf End Sub End Module ' The example displays output like the following: ' 11c43ee8-b9d3-4e51-b73f-bd9dda66e29c ' Empty: False ' ' 00000000-0000-0000-0000-000000000000 ' Empty: True
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